CVE-2023-26924: LLVM a0dab4950 has a segmentation fault in mlir::outlineSingleBlockRegion

Routine

MEDIUM 5.5DOWNGRADE

CVE-2023-26924 is a medium-severity flaw (CVSS 5.5) affecting llvm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LLVM a0dab4950 has a segmentation fault in mlir::outlineSingleBlockRegion. NOTE: third parties dispute this because the LLVM security policy excludes "Language front-ends ... for which a malicious input file can cause undesirable behavior."

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-120
Published	2023-03-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: llvm

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-03-27 22:15 UTCPublished CVE record published
2026-06-17 05:43 UTCUpdated Record last modified

llvm llvm DOWNGRADE

Affected: 2023-01-22

Fixed in: no fixed release known

Safe to downgrade to: a release before 2023-01-22

1. Check installed version

apt-cache policy llvm || rpm -q llvm || llvm --version

2. No fixed release: DOWNGRADE to a release before 2023-01-22 (Debian / Ubuntu)

apt-cache madison llvm sudo apt install llvm=<VERSION_BEFORE_2023-01-22> sudo apt-mark hold llvm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list llvm sudo dnf downgrade llvm-<VERSION_BEFORE_2023-01-22> sudo dnf versionlock add llvm

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-26924?

llvm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-26924 being exploited?

CVE-2023-26924 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-26924 affect?

CVE-2023-26924 affects llvm. Severity is medium (CVSS 5.5). LLVM a0dab4950 has a segmentation fault in mlir::outlineSingleBlockRegion. NOTE: third parties dispute this because the LLVM security policy excludes "Language front-ends ... for which a malicious input file can cause undesirable behavior."

How urgent is CVE-2023-26924?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2023-29942 MEDIUM 5.5 DOWNGRADE llvm-project commit a0138390 was discovered to contain a segmentation fault via the component mlir::Type::isa<
CVE-2023-29941 MEDIUM 5.5 DOWNGRADE llvm-project commit a0138390 was discovered to contain a segmentation fault via the component matchAndRewriteS
CVE-2023-29939 MEDIUM 5.5 DOWNGRADE llvm-project commit a0138390 was discovered to contain a segmentation fault via the component mlir::spirv::Tar
CVE-2023-29935 MEDIUM 5.5 DOWNGRADE llvm-project commit a0138390 was discovered to contain an assertion failure at !replacements.count(op) && "ope
CVE-2023-29934 MEDIUM 5.5 DOWNGRADE llvm-project commit 6c01b5c was discovered to contain a segmentation fault via the component mlir::Type::getDi

References

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